Black & white with red effect

Hi there, I am a new user to Premiere Pro, and I am trying to get a black and white effect and just leave a portion of the colour in red, aka Schindler's List with the girl and the red dress.
Does anyone know if this is possible, if so how it is done.
Thanks
Dave

Thanks,
I did find a demo of overlaying a face blur, and then making the background b&w and leaving a face in colour, and as my image was already red, i applied this technique. And the result is stunning!
That really is a good website, I will be learning more from it tonight I feel.